Initial revision

1 files changed, 558 insertions, 0 deletions

diff --git a/src/floatfns.c b/src/floatfns.c
new file mode 100644
index 00000000000..1cf132d5f5c
--- /dev/null
+++ b/src/floatfns.c
@@ -0,0 +1,558 @@
+/* Primitive operations on floating point for GNU Emacs Lisp interpreter.
+   Copyright (C) 1988 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include <signal.h>
+
+#include "config.h"
+#include "lisp.h"
+
+Lisp_Object Qarith_error;
+
+#ifdef LISP_FLOAT_TYPE
+#include <math.h>
+
+/* Nonzero while executing in floating point.
+   This tells float_error what to do.  */
+
+static int in_float;
+
+/* If an argument is out of range for a mathematical function,
+   that is detected with a signal.  Here is the actual argument
+   value to use in the error message.  */
+
+static Lisp_Object float_error_arg;
+
+#define IN_FLOAT(d, num) \
+(in_float = 1, float_error_arg = num, (d), in_float = 0)
+
+/* Extract a Lisp number as a `double', or signal an error.  */
+
+double
+extract_float (num)
+     Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Float)
+    return XFLOAT (num)->data;
+  return (double) XINT (num);
+}
+
+DEFUN ("acos", Facos, Sacos, 1, 1, 0,
+  "Return the inverse cosine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = acos (d), num);
+  return make_float (d);
+}
+
+DEFUN ("acosh", Facosh, Sacosh, 1, 1, 0,
+  "Return the inverse hyperbolic cosine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = acosh (d), num);
+  return make_float (d);
+}
+
+DEFUN ("asin", Fasin, Sasin, 1, 1, 0,
+  "Return the inverse sine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = asin (d), num);
+  return make_float (d);
+}
+
+DEFUN ("asinh", Fasinh, Sasinh, 1, 1, 0,
+  "Return the inverse hyperbolic sine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = asinh (d), num);
+  return make_float (d);
+}
+
+DEFUN ("atan", Fatan, Satan, 1, 1, 0,
+  "Return the inverse tangent of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = atan (d), num);
+  return make_float (d);
+}
+
+DEFUN ("atanh", Fatanh, Satanh, 1, 1, 0,
+  "Return the inverse hyperbolic tangent of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = atanh (d), num);
+  return make_float (d);
+}
+
+DEFUN ("bessel-j0", Fbessel_j0, Sbessel_j0, 1, 1, 0,
+  "Return the bessel function j0 of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = j0 (d), num);
+  return make_float (d);
+}
+
+DEFUN ("bessel-j1", Fbessel_j1, Sbessel_j1, 1, 1, 0,
+  "Return the bessel function j1 of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = j1 (d), num);
+  return make_float (d);
+}
+
+DEFUN ("bessel-jn", Fbessel_jn, Sbessel_jn, 2, 2, 0,
+  "Return the order N bessel function output jn of ARG.\n\
+The first arg (the order) is truncated to an integer.")
+  (num1, num2)
+     register Lisp_Object num1, num2;
+{
+  int i1 = extract_float (num1);
+  double f2 = extract_float (num2);
+
+  IN_FLOAT (f2 = jn (i1, f2), num1);
+  return make_float (f2);
+}
+
+DEFUN ("bessel-y0", Fbessel_y0, Sbessel_y0, 1, 1, 0,
+  "Return the bessel function y0 of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = y0 (d), num);
+  return make_float (d);
+}
+
+DEFUN ("bessel-y1", Fbessel_y1, Sbessel_y1, 1, 1, 0,
+  "Return the bessel function y1 of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = y1 (d), num);
+  return make_float (d);
+}
+
+DEFUN ("bessel-yn", Fbessel_yn, Sbessel_yn, 2, 2, 0,
+  "Return the order N bessel function output yn of ARG.\n\
+The first arg (the order) is truncated to an integer.")
+  (num1, num2)
+     register Lisp_Object num1, num2;
+{
+  int i1 = extract_float (num1);
+  double f2 = extract_float (num2);
+
+  IN_FLOAT (f2 = yn (i1, f2), num1);
+  return make_float (f2);
+}
+
+DEFUN ("cube-root", Fcube_root, Scube_root, 1, 1, 0,
+  "Return the cube root of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = cbrt (d), num);
+  return make_float (d);
+}
+
+DEFUN ("cos", Fcos, Scos, 1, 1, 0,
+  "Return the cosine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = cos (d), num);
+  return make_float (d);
+}
+
+DEFUN ("cosh", Fcosh, Scosh, 1, 1, 0,
+  "Return the hyperbolic cosine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = cosh (d), num);
+  return make_float (d);
+}
+
+DEFUN ("erf", Ferf, Serf, 1, 1, 0,
+  "Return the mathematical error function of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = erf (d), num);
+  return make_float (d);
+}
+
+DEFUN ("erfc", Ferfc, Serfc, 1, 1, 0,
+  "Return the complementary error function of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = erfc (d), num);
+  return make_float (d);
+}
+
+DEFUN ("exp", Fexp, Sexp, 1, 1, 0,
+  "Return the exponential base e of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = exp (d), num);
+  return make_float (d);
+}
+
+DEFUN ("expm1", Fexpm1, Sexpm1, 1, 1, 0,
+  "Return the exp (x)-1 of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = expm1 (d), num);
+  return make_float (d);
+}
+
+DEFUN ("log-gamma", Flog_gamma, Slog_gamma, 1, 1, 0,
+  "Return the log gamma of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = lgamma (d), num);
+  return make_float (d);
+}
+
+DEFUN ("log", Flog, Slog, 1, 1, 0,
+  "Return the natural logarithm of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = log (d), num);
+  return make_float (d);
+}
+
+DEFUN ("log10", Flog10, Slog10, 1, 1, 0,
+  "Return the logarithm base 10 of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = log10 (d), num);
+  return make_float (d);
+}
+
+DEFUN ("log1p", Flog1p, Slog1p, 1, 1, 0,
+  "Return the log (1+x) of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = log1p (d), num);
+  return make_float (d);
+}
+
+DEFUN ("expt", Fexpt, Sexpt, 2, 2, 0,
+  "Return the exponential x ** y.")
+  (num1, num2)
+     register Lisp_Object num1, num2;
+{
+  double f1, f2;
+
+  CHECK_NUMBER_OR_FLOAT (num1, 0);
+  CHECK_NUMBER_OR_FLOAT (num2, 0);
+  if ((XTYPE (num1) == Lisp_Int) && /* common lisp spec */
+      (XTYPE (num2) == Lisp_Int)) /* don't promote, if both are ints */
+    {                           /* this can be improved by pre-calculating */
+      int acc, x, y;            /* some binary powers of x then acumulating */
+      /* these, therby saving some time. -wsr */
+      x = XINT (num1);
+      y = XINT (num2);
+      acc = 1;
+      
+      if (y < 0)
+        {
+          for (; y < 0; y++)
+            acc /= x;
+        }
+      else
+        {
+          for (; y > 0; y--)
+            acc *= x;
+        }
+      return XSET (x, Lisp_Int, acc);
+    }
+  f1 = (XTYPE (num1) == Lisp_Float) ? XFLOAT (num1)->data : XINT (num1);
+  f2 = (XTYPE (num2) == Lisp_Float) ? XFLOAT (num2)->data : XINT (num2);
+  IN_FLOAT (f1 = pow (f1, f2), num1);
+  return make_float (f1);
+}
+
+DEFUN ("sin", Fsin, Ssin, 1, 1, 0,
+  "Return the sine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = sin (d), num);
+  return make_float (d);
+}
+
+DEFUN ("sinh", Fsinh, Ssinh, 1, 1, 0,
+  "Return the hyperbolic sine of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = sinh (d), num);
+  return make_float (d);
+}
+
+DEFUN ("sqrt", Fsqrt, Ssqrt, 1, 1, 0,
+  "Return the square root of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = sqrt (d), num);
+  return make_float (d);
+}
+
+DEFUN ("tan", Ftan, Stan, 1, 1, 0,
+  "Return the tangent of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = tan (d), num);
+  return make_float (d);
+}
+
+DEFUN ("tanh", Ftanh, Stanh, 1, 1, 0,
+  "Return the hyperbolic tangent of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  double d = extract_float (num);
+  IN_FLOAT (d = tanh (d), num);
+  return make_float (d);
+}
+
+DEFUN ("abs", Fabs, Sabs, 1, 1, 0,
+  "Return the absolute value of ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Float)
+    IN_FLOAT (num = make_float (fabs (XFLOAT (num)->data)), num);
+  else if (XINT (num) < 0)
+    XSETINT (num, - XFASTINT (num));
+
+  return num;
+}
+
+DEFUN ("float", Ffloat, Sfloat, 1, 1, 0,
+  "Return the floating point number equal to ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Int)
+    return make_float ((double) XINT (num));
+  else                          /* give 'em the same float back */
+    return num;
+}
+
+DEFUN ("logb", Flogb, Slogb, 1, 1, 0,
+  "Returns the integer that is the base 2 log of ARG.\n\
+This is the same as the exponent of a float.")
+     (num)
+Lisp_Object num;
+{
+  Lisp_Object val;
+  double f;
+
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+  f = (XTYPE (num) == Lisp_Float) ? XFLOAT (num)->data : XINT (num);
+  IN_FLOAT (val = logb (f), num);
+  XSET (val, Lisp_Int, val);
+  return val;
+}
+
+/* the rounding functions  */
+
+DEFUN ("ceiling", Fceiling, Sceiling, 1, 1, 0,
+  "Return the smallest integer no less than ARG.  (Round toward +inf.)")
+  (num)
+     register Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Float)
+    IN_FLOAT (XSET (num, Lisp_Int, ceil (XFLOAT (num)->data)), num);
+
+  return num;
+}
+
+DEFUN ("floor", Ffloor, Sfloor, 1, 1, 0,
+  "Return the largest integer no greater than ARG.  (Round towards -inf.)")
+  (num)
+     register Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Float)
+    IN_FLOAT (XSET (num, Lisp_Int, floor (XFLOAT (num)->data)), num);
+
+  return num;
+}
+
+DEFUN ("round", Fround, Sround, 1, 1, 0,
+  "Return the nearest integer to ARG.")
+  (num)
+     register Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Float)
+    IN_FLOAT (XSET (num, Lisp_Int, rint (XFLOAT (num)->data)), num);
+
+  return num;
+}
+
+DEFUN ("truncate", Ftruncate, Struncate, 1, 1, 0,
+       "Truncate a floating point number to an int.\n\
+Rounds the value toward zero.")
+  (num)
+     register Lisp_Object num;
+{
+  CHECK_NUMBER_OR_FLOAT (num, 0);
+
+  if (XTYPE (num) == Lisp_Float)
+    XSET (num, Lisp_Int, (int) XFLOAT (num)->data);
+
+  return num;
+}
+
+#ifdef BSD
+static
+float_error (signo)
+     int signo;
+{
+  if (! in_float)
+    fatal_error_signal (signo);
+
+#ifdef BSD4_1
+  sigrelse (SIGILL);
+#else /* not BSD4_1 */
+  sigsetmask (0);
+#endif /* not BSD4_1 */
+
+  in_float = 0;
+
+  Fsignal (Qarith_error, Fcons (float_error_arg, Qnil));
+}
+
+/* Another idea was to replace the library function `infnan'
+   where SIGILL is signaled.  */
+
+#endif /* BSD */
+
+init_floatfns ()
+{
+  signal (SIGILL, float_error);
+  in_float = 0;
+}
+
+syms_of_floatfns ()
+{
+  defsubr (&Sacos);
+  defsubr (&Sacosh);
+  defsubr (&Sasin);
+  defsubr (&Sasinh);
+  defsubr (&Satan);
+  defsubr (&Satanh);
+  defsubr (&Sbessel_y0);
+  defsubr (&Sbessel_y1);
+  defsubr (&Sbessel_yn);
+  defsubr (&Sbessel_j0);
+  defsubr (&Sbessel_j1);
+  defsubr (&Sbessel_jn);
+  defsubr (&Scube_root);
+  defsubr (&Scos);
+  defsubr (&Scosh);
+  defsubr (&Serf);
+  defsubr (&Serfc);
+  defsubr (&Sexp);
+  defsubr (&Sexpm1);
+  defsubr (&Slog_gamma);
+  defsubr (&Slog);
+  defsubr (&Slog10);
+  defsubr (&Slog1p);
+  defsubr (&Sexpt);
+  defsubr (&Ssin);
+  defsubr (&Ssinh);
+  defsubr (&Ssqrt);
+  defsubr (&Stan);
+  defsubr (&Stanh);
+
+  defsubr (&Sabs);
+  defsubr (&Sfloat);
+  defsubr (&Slogb);
+  defsubr (&Sceiling);
+  defsubr (&Sfloor);
+  defsubr (&Sround);
+  defsubr (&Struncate);
+}
+
+#else /* not LISP_FLOAT_TYPE */
+
+init_floatfns ()
+{}
+
+syms_of_floatfns ()
+{}
+
+#endif /* not LISP_FLOAT_TYPE */